hallo marcos if you want to measure audio files and not realtime signals, you could use FScape http://sourceforge.net/projects/fscape . There are two modules : "Change Gain" has an info button that will put out the peak and RMS of a file. Alternatively you can use "Serial Killa" to make an energy analysis which is a weighted sum of the spectral bands of a file, using a coarse psychoacoustic weighting function. but honestly, better use your ears to match two soundfiles for equal loudness! ciao, -sciss- [...] ___________________________________________________________ Gesendet von Yahoo! Mail - Jetzt mit 1GB Speicher kostenlos - Hier anmelden: http://mail.yahoo.de